Difference between revisions of "Intel GM45 TPM device iTPM INTC0102"

From ThinkWiki
Jump to: navigation, search
Line 20: Line 20:

Revision as of 10:49, 9 February 2010

INTC0102 Intel TPM device found in GM45 chipset is supposed to comply with TCG TPM 1.2 specifications, and thus be taken care of by tpm_tis kernel module. Unfortunately, it does not. After loading this module

modprobe tpm_tis interrupts=0 force=1

and mounting securityfs

mount -t securityfs none /sys/kernel/security

it is possible to read the files


but no further communication with the TPM device seems to be possible.

In recent discussion on tpmdd-devel mailing list Seiji Munetoh suggested a quick fix, and Colin Didier made a patch out of it.

Note, however, that tpm_tis has to be compiled as a module and unloaded before suspend-to-disk, or it would freeze on wake-up. Suspend-to-ram seems to be OK, moreover if you unload tpm_tis before suspend-to-ram and modprobe in after resume -- then trousers daemon will refuse to restart. To get trousers run again, you have to either reboot or suspend-to-disk/wake-up.